Sneaking · European Union

Drip pricing and hidden charges

Drip pricing reveals unavoidable or foreseeable charges only after a consumer has started a transaction. Existing EU rules already govern price information and misleading omissions in many consumer journeys. Not every later price change is unlawful, for example, genuinely optional choices can alter a total, but mandatory charges should be identified and included at the legally relevant time.

Current law
Family
Sneaking
Also known as
  • partitioned pricing
  • hidden mandatory fees
  • progressive fee disclosure
  • hidden charges
  • drip pricing
  • late mandatory fee
Journey stages
See visual examplesBrowse all dark patterns

Definition

What is this pattern?

A mandatory or foreseeable charge is omitted, obscured or revealed only after the user has invested effort in the transaction. The label describes a recurring design mechanism; whether a particular implementation is harmful or unlawful depends on the complete journey, audience, evidence and rules within scope.

How it works

A mandatory or foreseeable charge is omitted, obscured or revealed only after the user has invested effort in the transaction. A foreseeable compulsory charge is withheld until later effort has been invested, making the offer appear cheaper at search, selection or comparison.

Warning signs

  • A price is displayed before a later charge becomes visible.
  • The charge is mandatory, transaction-linked or reasonably foreseeable for the selected path.
  • Earlier presentation does not effectively communicate amount, method or inclusion status.

Potential harms

  • Late disclosure can make the offer appear cheaper and exploit effort already invested in checkout.
  • Travellers may compare and select rooms using an understated unavoidable cost.

Learn by comparison

What does this look like?

These fictional examples make the design mechanism easier to recognise. They do not depict a real company and do not establish that an individual interface is unlawful.

Illustrative example 1 · Ticket booking

A fictional booking site shows a €40 ticket through search and selection but adds a compulsory €9 service fee only after card details are entered.

Potential consumer harm: Late disclosure can make the offer appear cheaper and exploit effort already invested in checkout.

Illustrative example 2 · Accommodation booking

A fictional hotel result advertises €120 per night while a compulsory €28 nightly facility fee appears only in the final booking summary.

Potential consumer harm: Travellers may compare and select rooms using an understated unavoidable cost.

Illustrative example 3 · Event tickets

A ticket is advertised at €40, but a mandatory €6 fulfilment charge appears only after seat selection and cannot be removed for any available delivery method.

Potential consumer harm: The buyer may compare offers and invest effort using a price that was never actually available.

Illustrative example 4 · Food delivery

A basket total excludes a compulsory small-order fee that is added at the final payment step even though basket value and delivery address were known earlier.

Potential consumer harm: The consumer may proceed past comparison and abandon or overpay after a late unavoidable increase.

Ticket bookingCheckout

Mandatory service fee revealed after payment details

A fictional booking site shows a €40 ticket through search and selection but adds a compulsory €9 service fee only after card details are entered.

Potentially problematicTicket · €40
Neutral alternativeTicket total · €49

Why the first version can mislead: The final commercial state diverges from the choice represented earlier in the journey. The problematic state records: “A mandatory €9 service fee appears only after card entry.” Review the timing and affirmative selection needed before “Continue to payment” changes price, product or recurring liability. Late disclosure can make the offer appear cheaper and exploit effort already invested in checkout.

What a fairer design does: Show the foreseeable payable total and compulsory fee near the first material price and preserve it throughout the journey.

Show annotated differences (2)
Potentially problematic version
  • Pay €49In “Mandatory service fee revealed after payment details”, this element shows how hidden costs or drip pricing can shape the decision.
Neutral alternative
  • Payable total and selected items, expanded: The summary shows the line items and total before “Pay €49” is activated.In “Mandatory service fee revealed after payment details”, this element keeps the clearer alternative visible at the same decision point.
Review questions (3)
  • Which affirmative action authorises “Continue to payment”, and where is the resulting price, product or recurring state shown before commitment?
  • Compare the basket before and after the action, including total and line items; does the mutation satisfy “A price is displayed before a later charge becomes visible”?
  • Which specific affirmative event creates the final commercial state, and could “Optional add-on deliberately selected” explain the observed outcome instead?
Side-by-side ticket booking interface showing “Ticket · €40” and the clearer alternative “Ticket total · €49”.Provenance: Original hypothetical ticket booking example created for this library; no real business, product or interface is depicted.
Open this example on its own page
Accommodation bookingPricing

Resort fee appears after room selection

A fictional hotel result advertises €120 per night while a compulsory €28 nightly facility fee appears only in the final booking summary.

Potentially problematicRoom · €120/night
Neutral alternativeRoom total · €148/night

Why the first version can mislead: The final commercial state diverges from the choice represented earlier in the journey. The problematic state records: “The unavoidable €28 nightly fee is omitted from search and room cards.” Review the timing and affirmative selection needed before “Select room” changes price, product or recurring liability. Travellers may compare and select rooms using an understated unavoidable cost.

What a fairer design does: Include compulsory charges in the comparable total and explain any component breakdown before room selection.

Show annotated differences (2)
Potentially problematic version
  • Choose at €148/nightIn “Resort fee appears after room selection”, this element shows how hidden costs or drip pricing can shape the decision.
Neutral alternative
  • Price, period and commitment, expanded: The price and material terms associated with “Choose at €148/night” remain beside this choice.In “Resort fee appears after room selection”, this element keeps the clearer alternative visible at the same decision point.
Review questions (3)
  • Which affirmative action authorises “Select room”, and where is the resulting price, product or recurring state shown before commitment?
  • Place the compared prices, billing periods and material terms on one evidence sheet; where does it support “The charge is mandatory, transaction-linked or reasonably foreseeable for the selected path”?
  • Which specific affirmative event creates the final commercial state, and could “variable charge impossible to calculate but calculation method and applicability clearly disclosed” explain the observed outcome instead?
Side-by-side accommodation booking interface showing “Room · €120/night” and the clearer alternative “Room total · €148/night”.Provenance: Original hypothetical accommodation booking example created for this library; no real business, product or interface is depicted.
Open this example on its own page

What is a fairer alternative?

Display the total including mandatory charges as soon as the necessary information is available, explain any genuinely variable component, and separate optional extras without preselection. Preserve an itemised breakdown so users can understand rather than reconstruct the total.

Context matters

Context and boundary cases

  • A price is displayed before a later charge becomes visible.
  • The charge is mandatory, transaction-linked or reasonably foreseeable for the selected path.
  • Earlier presentation does not effectively communicate amount, method or inclusion status.
  • Exclude or qualify the label where optional add-on deliberately selected.
  • Exclude or qualify the label where variable charge impossible to calculate but calculation method and applicability clearly disclosed.
  • Exclude or qualify the label where government charge clearly disclosed at the initial price.

When a similar design can serve a legitimate purpose

  • A similar design should not be classified this way where optional add-on deliberately selected.
  • A similar design should not be classified this way where variable charge impossible to calculate but calculation method and applicability clearly disclosed.
  • A similar design should not be classified this way where government charge clearly disclosed at the initial price.

Operational review

What teams should review

Teams
  • Product
  • UX
  • Legal
  • Engineering
  • Content design
  1. Which affirmative action authorises “Continue to payment”, and where is the resulting price, product or recurring state shown before commitment?
  2. Compare the basket before and after the action, including total and line items; does the mutation satisfy “A price is displayed before a later charge becomes visible”?
  3. Which specific affirmative event creates the final commercial state, and could “Optional add-on deliberately selected” explain the observed outcome instead?
  4. Which affirmative action authorises “Select room”, and where is the resulting price, product or recurring state shown before commitment?
  5. Place the compared prices, billing periods and material terms on one evidence sheet; where does it support “The charge is mandatory, transaction-linked or reasonably foreseeable for the selected path”?
  6. Which specific affirmative event creates the final commercial state, and could “variable charge impossible to calculate but calculation method and applicability clearly disclosed” explain the observed outcome instead?
  7. Which complete journey evidence supports or contradicts the hidden costs or drip pricing classification?

Evidence to retain

  • Versioned captures of the Checkout and Pricing states before, during and after the relevant decision
  • Configuration, content and event records supporting the observed hidden costs or drip pricing mechanism
  • Responsive, keyboard and assistive-technology review of every material option and consequence
  • Price-component, offer-version and calculation records linked to the captured screen

Legal map and implementation tools

Open the current-law mapUse the readiness checklist

Evidence base

Sources

  1. Dark commercial patternsOrganisation for Economic Co-operation and Development · Secondary · checked 2026-09-14 · OECD Digital Economy Papers No. 336
  2. Unfair Commercial Practices DirectiveEuropean Parliament and Council of the European Union · Primary · checked 2026-08-09 · Directive 2005/29/EC; CELEX 02005L0029-20220528
  3. Consumer Rights DirectiveEuropean Parliament and Council of the European Union · Primary · checked 2026-08-09 · Directive 2011/83/EU; CELEX 02011L0083-20220528
  4. Digital Fairness Act: call for evidence for an impact assessmentEuropean Commission · Primary · checked 2026-08-09 · Initiative 14622; Ares(2025)6275573
  5. Digital Services ActEuropean Parliament and Council of the European Union · Primary · checked 2026-08-09 · Regulation (EU) 2022/2065; CELEX 32022R2065
  6. Consumer Protection Cooperation Network sweepsEuropean Commission · Primary · checked 2026-09-14
  7. Review of EU consumer lawEuropean Commission, Directorate-General for Justice and Consumers · Primary · checked 2026-09-14
  8. 2030 Consumer Agenda and action plan for consumers in the Single MarketEuropean Commission · Primary · checked 2026-08-09 · COM(2025) 848 final; CELEX 52025DC0848
  9. Fitness Check of EU consumer law on digital fairnessEuropean Commission · Primary · checked 2026-09-14 · SWD(2024) 230 final
  10. Commission work programme 2026: Europe's Independence MomentEuropean Commission · Primary · checked 2026-09-14 · COM(2025) 870 final; CELEX 52025DC0870; Annex I item 30